Screen



May 17, 1932. J DAVls 1,858,917

SCREEN Original Filed Dec. 14, 1927 2 Sheets-Sheet. 1

17111970507: Won/45 J pflv/aflmwsm T. J. DAVIS SCREEN Original Filed Dec. 14. 1927 2 Sheets-Sheet Patented May 17, 1932 UNITED STATES PATENT OFFICE- TEOMAS J. DAVIS, DECEASED, LATE 0F DUQUESNE, PENNSYLVANIA, BY CLARA J'. DAVIS, EXECUTRIX, OF DUQUESNE PENNSYLVANIA SCIIB'JEIEN H Original application filed December 14, 1927, Seria1 No. 239,958. Divided and. this January 25, 1929.

This invention relates to screens and more particularly to vibrating screens, and has for one of its objects the provision of a novel screen construction in which the screening elements will have a combined vertical and horizontal vibrating movement.

Another object is to provide a screen hav- 'ing a novel supporting structure which may be adjusted to vary the inclination of the screen.

A further object is to provide a screen having the novel combination, construction and design of parts hereinafter described and i1 lustrated in the accompanying drawings.

This. application is a division of application Ser. N 0. 239,958, filed Dec. 14, 1927.

In the drawings Figure 1 is a side elevation, partly in section, of a screen constructed in accordance with this invention.

Figure 2 is a plan view partly in section, taken on the line IIII of Figure 1.

Figure 3 is a transverse sectional view taken on the line IIIIII of Figure 2.

Referring more particularly to the drawings, the numeral 2 designates a base on which a vertical support 3 is mounted. The upper or rear end of a screen frame 4 is hingedly secured to the support, as at 5. The frame 3 is built up of rolled metal shapes and plates so as to form a rigid structure of rectangular shape or outline. The forward or lower end of the frame 4 is adapted to be adjustab-ly supported by supporting bolts 6, which are hingedly mounted on the base 2 and have their upper ends projected through apertures in the frame 4. Nuts 7 are threaded on the bolts 6 to adjustably position the frame 4 on the bolts 6.

A one-piece cloth screen A, comprising a rigid frame 40 on which screen cloth 41 is stretched, is mounted in the frame 4 and is supported horizontally by the springs 12 which are secured to the ends of the frame 40 and ends of the frame 4. The screen A is supported vertically by vertical springs 17 which are mounted on transverse members 16 adjacent each end of the frame 4. The upper ends of the springs 17 are secured to the ends of the screen frame 40.

Serial No. 35,970. v v i A pair of longitudinalbars 42 are extended from'endto end of. the frame 40 under the screencloth 41, and suitable bracket-plates 43 are secured thereto to support pivotv pins 44 to which connecting rods 20 are connected.

The connecting rods 20 extend rearwardly through apertures in a guide-plate 21 on the vertical support 3.

, A bracket 22 is secured to the rear side of the support 3 and serves to support a housing 23' which is. adjustably' clamped in position relative to the screen frame '4 by clamping bolts 24. A cam-shaft 25 is journaled in the housing 23 and isfconnected to a driving m0- tor 26 by means of a coupling 27. The camshaft 25 is provided with a number of cams 28, each one of which is positioned slightly in advance of the other on the shaft 25.

A plurality of guides 30 project through the forward side of the housing 23 in2line with therespective cams 28, and pushrods 29 are'mounted in the guides 30 and are in en gagement with the cams 28. The connecting rods 20 are each provided at their rear ends with a guide nut 32 having a cupped or. recessedrrear end 33 to receive the headed forward end of one of the push-rods 29., A cushe ion member 34 is mounted ineach of the recessed rear ends 33 of the guide nuts 32 to cushion the blow delivered by the push-rods. In operation, the motor .26 will rotate the cam-shaft '25 which will cause the cams 28 to engage the push-rods 29. The push-rods 29 will force'the conn ectingrods .20 forwardly and upwardly'when the high point of the loam is against the push-rods, thus moving the. screen A forwardly and upwardly against the tension of the springs 12 and 17, and as the high points of the cams 28 pass over the pushrods 29 the springs 12 and 17 will compel the screen A to move rearwardly and downwardly. The above actions are. very rapid and cause a vibrating action of the-screen.

In the drawings a plurality of guides 30 and cams 28 are shown, while only two guides and cams are necessary for the two push-rods 29 and connecting rod 20. However, the extra guides and cams are provided so that other forms of screens (not shown) necessiapplication filed tating more than two push-rods and connecting-rods may be used, if desired.

lVhile there has been shown and described a certain specific embodiment of the invention, it will be understood that the invention is not limited thereto, since various modifications may be made Without departing from the scope of the invention as defined in theappended claims.

What is claimed is- 1. In a screening mechanism an inclined rigid frame, a rigid support for the rear end of said frame, a single screening element mounted in and substantially filling the space within said frame, resilient means for supporting said element vertically and horizontally, and means for moving said screening element against the tension of at least some of said resilient means, said means including a cam-shaft mounted on said rigid support,

cams on said shaft, and a plurality of connecting rods connected to said single element and adapted to be alternately engaged by said cams.

2. In a screening mechanism an inclined rigid frame, a rigid support for the rear end of said frame, a single rigid rectangular screen frame mounted in and substantially filling the space Within said first named frame, screen mesh cloth mounted on said screen frame, resilient means forming connections between the opposite ends of said screen frame and the ends of said first named frame, other resilient means for supporting said screen frame vertically in said first named frame, and means for moving said screen frame against the tension of said resilient means, said means comprising a housing supported on said rigid support, a cam-shaft journaled in said housing, cams on said shaft, apair of push-rods reciprocably mounted in said housing and adapted to be reciprooated by said cams, and a pair of connecting rods connected to said screen frame at transversely spaced points and operated by said push-rods.

In testimony whereof I have hereunto set my hand.

CLARA J. DAVIS, Eweeutfiar of the Estate of Thomas J. Davis,

deceased. 

